How to judge the quality of the expanded metal?
By general looking, the expanded metal should be clean, even mesh size and flat surface.
If you have ordered expanded stainless steel, the supplier should include the stainless steel material certificate, as there are thousands of stainless steel manufacturers in China, some of them do not issue material certificate, and some of them are really bad quality. If the expanded metal is in other material like expanded plain steel or expanded aluminum, it is not necessary that the supplier do not have a material certificate, as most of the steel sheets and aluminum sheets are from big factories and most of the quality are satisfied.
The mesh direction. The mesh direction should be even and give you a nice structure looking no matter what view you see them.
The mesh quality. The mesh quality should be very even; at least you cannot see any difference from your eye looking.
The surface. The surface should be very clean except there are some oil paintings on it made by purpose for preventing the rust.
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